UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 449

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

Cautions 1. The receive buffer (RXB/RXB2) must be read even if there is a receive error.
Figure 16-4 Format of Asynchronous Serial Interface Status Register (ASIS) and Asynchronous Serial
ASIS2
ASIS
2. To disable the reception completion interrupt when a reception error occurs, make sure that wait
7
0
0
If RXB/RXB2 is not read, an overrun error will occur when the next data is received, and the receive
error state will continue indefinitely.
time equivalent to two pulses of the clock that serves as the reference of the baud rate clock elapse
after the reception error occurs until the receive buffers (RXB, RXB2) are read. If the wait time
is not inserted, the reception completion interrupt occurs even when it is disabled.
The wait time equivalent to two pulses of the clock that serves as the reference of the baud rate
clock can be calculated by the following expression:
Wait time =
Remark f
Interface Status Register 2 (ASIS2)
CHAPTER 16 ASYNCHRONOUS SERIAL INTERFACE/3-WIRE SERIAL I/O
6
0
0
n : Value of baud rate generator control registers (BRGC, BRGC2) to select tap of 12-bit
XX
5
0
0
: Oscillation frequency
2
f
n+3
XX
prescaler (n = 0 to 11)
4
0
0
3
0
0
PE2
PE
2
FE2
FE
1
OVE2
OVE
0
Overrun error flag
Framing error flag
Parity error flag
Address
0FF8AH
0FF8BH
1
1
1
Next receive completed before data is
read from receive buffer
Stop bit not detected
Transmit data parity specification and
receive data parity do not match
On Reset
00H
00H
R/W
R
R
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